
 /*
 * 用于操作浏览器Cookie的轻量级JS库。
 * 常用API：
 *   Cookies.set(name, value, options) // 设置Cookie
 *   Cookies.get(name)                // 获取Cookie
 *   Cookies.remove(name)             // 删除Cookie
 *
 * Released under the MIT license
 */
(function (factory) {
	var registeredInModuleLoader = false;
	if (typeof define === 'function' && define.amd) {
		define(factory);
		registeredInModuleLoader = true;
	}
	if (typeof exports === 'object') {
		module.exports = factory();
		registeredInModuleLoader = true;
	}
	if (!registeredInModuleLoader) {
		var OldCookies = window.Cookies;
		var api = window.Cookies = factory();
		api.noConflict = function () {
			window.Cookies = OldCookies;
			return api;
		};
	}
}(function () {
	// 合并多个对象属性
	function extend() {
		var i = 0;
		var result = {};
		for (; i < arguments.length; i++) {
			var attributes = arguments[i];
			for (var key in attributes) {
				result[key] = attributes[key];
			}
		}
		return result;
	}

	// 初始化主API
	function init(converter) {
		function api(key, value, attributes) {
			var result;
			if (typeof document === 'undefined') {
				return;
			}

			// 写入Cookie
			if (arguments.length > 1) {
				attributes = extend({ path: '/' }, api.defaults, attributes);

				if (typeof attributes.expires === 'number') {
					var expires = new Date();
					expires.setMilliseconds(expires.getMilliseconds() + attributes.expires * 864e+5);
					attributes.expires = expires;
				}

				// 兼容IE，使用expires而不是max-age
				attributes.expires = attributes.expires ? attributes.expires.toUTCString() : '';

				try {
					result = JSON.stringify(value);
					if (/^[\{\[]/.test(result)) {
						value = result;
					}
				} catch (e) {}

				if (!converter.write) {
					value = encodeURIComponent(String(value))
						.replace(/%(23|24|26|2B|3A|3C|3E|3D|2F|3F|40|5B|5D|5E|60|7B|7D|7C)/g, decodeURIComponent);
				} else {
					value = converter.write(value, key);
				}

				key = encodeURIComponent(String(key));
				key = key.replace(/%(23|24|26|2B|5E|60|7C)/g, decodeURIComponent);
				key = key.replace(/[\(\)]/g, escape);

				var stringifiedAttributes = '';
				for (var attributeName in attributes) {
					if (!attributes[attributeName]) continue;
					stringifiedAttributes += '; ' + attributeName;
					if (attributes[attributeName] === true) continue;
					stringifiedAttributes += '=' + attributes[attributeName];
				}
				return (document.cookie = key + '=' + value + stringifiedAttributes);
			}

			// 读取Cookie
			if (!key) {
				result = {};
			}
			var cookies = document.cookie ? document.cookie.split('; ') : [];
			var rdecode = /(%[0-9A-Z]{2})+/g;
			var i = 0;
			for (; i < cookies.length; i++) {
				var parts = cookies[i].split('=');
				var cookie = parts.slice(1).join('=');
				if (cookie.charAt(0) === '"') {
					cookie = cookie.slice(1, -1);
				}
				try {
					var name = parts[0].replace(rdecode, decodeURIComponent);
					cookie = converter.read ?
						converter.read(cookie, name) : converter(cookie, name) ||
						cookie.replace(rdecode, decodeURIComponent);
					if (this.json) {
						try {
							cookie = JSON.parse(cookie);
						} catch (e) {}
					}
					if (key === name) {
						result = cookie;
						break;
					}
					if (!key) {
						result[name] = cookie;
					}
				} catch (e) {}
			}
			return result;
		}

		// API别名
		api.set = api;
		api.get = function (key) {
			return api.call(api, key);
		};
		api.getJSON = function () {
			return api.apply({ json: true }, [].slice.call(arguments));
		};
		api.defaults = {};

		// 删除Cookie
		api.remove = function (key, attributes) {
			api(key, '', extend(attributes, { expires: -1 }));
		};

		api.withConverter = init;
		return api;
	}

	// 默认导出
	return init(function () {});
}));
